CN101409560A - Apparatus and method for eliminating blasting noise of digital-analog converter - Google Patents
Apparatus and method for eliminating blasting noise of digital-analog converter Download PDFInfo
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Abstract
The invention relates to a device for eliminating the Pop_Click noise caused by switching working mode in a DAC and a method thereof. The device comprises a chip state machine, a volume control unit, a de-emphasis/interpolation filter, a multidigit Sigma-Delta regulator and a dynamic element matching unit, a low-pass filter, a sound mixer, an output amplifying and driving unit, a selector and a noise eliminating control unit; in the working mode switching process of the chip, the noise eliminating control unit controls the volume control unit, the sound mixer and the gain change of the output amplifying driver. The invention solves the problem that voltage jump exists at the analog output terminal of an audio DAC, thus the problem that Pop_Click noise exists in the switching between normal mode and standby mode and in the electrifying and deenergizing process of the audio DAC.
Description
Technical field
The present invention relates to audio frequency digital-to-analogue conversion (DAC) field, refer in particular to a kind of cancellation element and method of explosion (Pop_Click) noise that upward and downward electric process and mode of operation cause in switching in audio digital to analog converter.
Background technology
∑-Δ data conversion technique is a technology that is widely used in the digital-to-analogue conversion of high accuracy audio frequency.The audio digital to analog converter that utilizes ∑-Δ data conversion technique is mainly by forming with lower module: audio serial interface, chip status machine, Serial Control port, connect sample rate detection/timer manager, the volume control unit of CLKIN pin, postemphasis/interpolation filter, multidigit ∑-Δ adjuster DSM and dynamic element matching unit DEM, low pass filter (analog switch capacitance filter SCF), mixer, driver element, selector and analog reference voltage generator are amplified in output.Figure 1 shows that the digital to analog converter basic structure block diagram of a passage.Wherein:
The chip status machine: controlling the mode of operation of chip, and the switching programme of each element circuit under the different working modes.
Serial Control port: the various settings and the chip operation pattern that receive the user from SCLK, SDA, SCS pin.
Sample rate detection/timer manager: the chip Clock management, detect the sample rate of audio frequency serial data simultaneously and give state machine.
The audio frequency serial port: receive the serial audio signal of multiple form from SDATA, BCLK, LRCK pin, and with serial data and be converted into parallel form.
Volume control unit: control decays and attenuation change speed to the voice data of input.
Postemphasis/interpolation filter, multidigit ∑-Δ adjuster DSM and dynamic element matching unit DEM: is the input data conversion of high-resolution (representative value is 16 to 24), low sample frequency (representative value is that 8KHz is to 200KHz) digital signal of low resolution (representative value is 1 to 6), high sample frequency (representative value is 32 to 128 times of incoming frequency).
Low pass filter SCF: the digital signal of above-mentioned low resolution, high sample frequency is converted into analog signal, exports mixer to.
Mixer: audio analog signals and other simulated audio signal of digital to analog converter output are carried out the audio mixing processing, and the gain of mixer can be provided with by the user.
Driver element is amplified in output: the audio analog signals of mixer output is amplified, drive outside earphone or loud speaker, amplifier gain can be provided with by the user.
Selector: the analog output at audio digital to analog converter is used for selecting output simulated audio signal or output analog references common-mode voltage.
Analog reference voltage generator: produce an analog references common-mode voltage (representative value is half of input supply voltage).
The common problem that present commercial digital to analog converter DAC exists is that in mode of operation switching and chip upward and downward electric process, DAC can produce explosion (Pop_Click) noise.For these DAC devices, there is voltage jump at analog output, thereby causes the input of player to have the input voltage saltus step, so in the transfer process of power-on and power-off and mode of operation, produce explosion (Pop_Click) noise.
Summary of the invention
The objective of the invention is to propose a kind of new numerical control noise elimination apparatus and method, with explosion (Pop_Click) noise that causes in mode of operation switching and the upward and downward electric process in the elimination audio digital to analog converter, with the noise problem that solves audio digital to analog converter DAC.
The object of the present invention is achieved like this:
A kind of cancellation element of digital to analog converter borehole blasting noise, it comprises the chip status machine, volume control unit, low pass filter, mixer, driver element and selector are amplified in output:
Described chip status machine is being controlled the mode of operation of chip, and the switching programme of each element circuit under the different working modes;
Described volume control unit, control decays and attenuation change speed to the voice data of input;
Described low pass filter is converted into simulated audio signal to the digital audio and video signals of low resolution, high sample frequency, exports mixer to;
Described mixer, audio analog signals and other simulated audio signal that low pass filter is exported carry out the audio mixing processing, and the gain of mixer can be provided with by the user;
Driver element is amplified in described output, and the audio analog signals that mixer is exported amplifies, and drives outside earphone or loud speaker, and amplifier gain can be provided with by the user;
Described selector is used for selecting output simulated audio signal or output analog references common-mode voltage at the analog output of audio digital to analog converter;
The cancellation element of described digital to analog converter borehole blasting noise also comprises a de-noising control unit, this de-noising control unit is according to the state of described chip status machine, start-up mode switching control program in chip operation mode switch process, thereby control volume control unit, low pass filter, mixer, driver element, the switch of selector and the situation of change of gain thereof are amplified in output.
This cancellation element also comprises and postemphasising/interpolation filter and multidigit ∑-Δ adjuster DSM and dynamic element matching unit DEM, audio signal exports this to through volume control unit and postemphasises/interpolation filter and multidigit ∑-Δ adjuster DSM and dynamic element matching unit DEM and described low pass filter, exports described mixer to through low pass filter then.
A kind of removing method of digital to analog converter borehole blasting noise, it is characterized in that: chip power, down electricity, switch to normal mode of operation and when normal mode of operation switches to standby mode from standby mode, a corresponding with it switch control program is all arranged, be used for eliminating the Property of Blasting Noise that produces in the corresponding work process;
(1) control program in the power up is as follows:
Step 1, selector are selected output analog references common-mode voltage;
Step 2, mixer and output are amplified driver element and are all entered standby mode; The initial setting up of volume control unit is maximum attenuation N dB, and the gain of mixer is maximum attenuation M dB, and the gain that driver element is amplified in output is maximum attenuation K dB;
(2) control program under in the electric process is as follows:
Step 1, the gain of volume control unit is provided with beginning from the user is decreased to maximum attenuation NdB gradually with a certain step-length, the gain of output amplification driver element is provided with beginning from the user and is decreased to maximum attenuation KdB gradually with a certain step-length, and the gain of mixer is provided with beginning from the user and is decreased to maximum attenuation MdB gradually with a certain step-length;
Step 2, mixer and output are amplified driver element and are entered standby mode;
Step 3, selector are selected output analog references common-mode voltage;
(3) it is as follows to switch to the control program of normal mode of operation from standby mode:
Step 1, state machine receive the instruction of operate as normal, and the de-noising control unit starts the changeover program from the standby mode to the normal mode; This moment, selector was still selected output simulation common-mode voltage (simulation ground level);
Step 2, mixer switch to normal mode of operation from standby mode, mixer output simulation ground level;
The gain of step 3, mixer slowly is increased to the gain that the user is provided with a certain step-length from maximum attenuation MdB;
Step 4, output are amplified driver element and are switched to normal mode of operation from standby mode, output simulation ground level, and the gain that driver element is amplified in output still is maximum attenuation KdB gain;
Step 5, de-noising control unit switch selector, select output to amplify the signal of driver element, and two inputs of selector all remain on the simulation common-mode voltage owing to this moment, so guaranteed seamlessly transitting of chip simulation output when selector switches;
The gain that driver element is amplified in step 6, output slowly is increased to the gain that the user is provided with a certain step-length from maximum attenuation KdB;
Step 7, volume control unit switch to normal mode of operation from standby mode, and this moment, the gain of volume control unit was maximum attenuation NdB;
The gain of step 8, volume control unit slowly is increased to the gain that the user is provided with a certain step-length from-NdB, thereby makes the signal level of analog output slowly be varied to the audio user analog signal from simulation common-mode voltage (simulation ground level);
(4) it is as follows to switch to the control program of standby mode from normal mode:
Step 1, state machine receive the instruction (for example the user is provided with register by the Serial Control port) that enters standby mode work, and the de-noising control unit starts the changeover program from the normal mode to the standby mode;
The gain of step 2, volume control unit is provided with beginning from the user and is decreased to maximum attenuation NdB gradually with a certain step-length;
Step 3, volume control unit, postemphasis/interpolation filter, multidigit ∑-Δ adjuster DSM and dynamic element matching unit DEM switch to standby mode;
The gain of step 4, output amplification driver element is provided with beginning from the user and is decreased to maximum attenuation KdB gradually with a certain step-length;
The gain of step 5, mixer is provided with beginning from the user and is decreased to maximum attenuation MdB gradually with a certain step-length;
Step 6, selector are selected analog reference voltage output;
Step 7, output are amplified driver element and are entered the stand-by operation pattern;
Step 8, mixer and low pass filter also all enter the stand-by operation pattern.
In the described control program, the change in gain order of driver element is amplified in volume control unit, mixer, output can do corresponding transposing according to different digital-to-analog converter structures; The switching sequence of driver element is amplified in volume control unit, mixer, output can do corresponding transposing according to different digital-to-analog converter structures.
On the silicone tube chip of audio digital to analog converter, voice data enters volume control unit by the audio frequency serial port, and the user is provided with the volume of volume control unit and the volume gradual speed that decays by serial control interface; Audio signal exports to through volume control unit and postemphasises/interpolation filter, multidigit ∑-Δ adjuster and dynamic element matching unit and low pass filter.The output of low pass filter and other analogue audio frequency input signal all enter mixer, and the output behind the audio mixing enters the output amplification driver.The user can control the gain of mixer and output amplification driver by serial control interface.Chip status machine control said units is controlled the de-noising control unit according to the feedback signal and being provided with of user of volume control unit simultaneously.In the handoff procedure of chip operation pattern, the change in gain of the control of de-noising control unit volume control unit, mixer and output amplification driver.
In power up, selector is selected the output analog reference voltage, has shielded the output signal that driver element is amplified in output, effectively eliminates explosion (Pop_Click) noise that the data transaction passage produces in power up.After power up continued for some time, described digital to analog converter entered the stand-by operation pattern automatically.
In following electric process, the gain of at first volume control unit, output being amplified driver element, mixer is provided with beginning from separately user and is decreased to separately maximum attenuation gradually with a certain step-length, makes the analog output voltage of digital to analog converter decay to the simulation common-mode voltage gradually from Audio Meter.Then, de-noising control unit control selector is selected analog reference voltage output, makes the analog output of digital to analog converter realize the smooth transition of level.At last, disconnect the power supply of chip, since analog reference voltage in following electric process along with supply voltage slowly drops to low level, this moment, selector shielded the output signal that driver element is amplified in output, effectively eliminated explosion (Pop_Click) noise that the data transaction passage produces in following electric process.
Under the stand-by operation pattern, selector is selected output common mode voltage.When the user configures after all registers are provided with, state machine switches to normal operating conditions from holding state, and the control unit of de-noising simultaneously starts mixer, driver element and the changeover program of volume control unit from the standby mode to the normal mode are amplified in output.At first open mixer, driver element is amplified in output, enters normal mode of operation by standby mode, output simulation common-mode voltage (simulation ground level); The de-noising control unit switches selector, selects output to amplify the signal of driver element.The gain that driver element, volume control unit are amplified in de-noising control unit control mixer, output slowly is increased to the gain that the user is provided with a certain step-length from maximum attenuation separately, make voice data slowly change to the gain level that the user needs from minimum value, make the signal level of analog output slowly be varied to audio analog signals, avoided effectively switching to voltage jump in the normal mode process and explosion (Pop_Click) noise that causes by standby mode from the simulation common-mode voltage.
Under normal mode of operation, after sending the instruction that enters standby mode as the user, state machine switches to standby mode from normal mode, and the de-noising control unit starts volume control unit, mixer and output and amplifies the changeover program of driver element from the normal mode to the standby mode.The gain that driver element, mixer are amplified in volume control unit, output respectively is decreased to maximum attenuation since the user is provided with beginning with a certain step-length gradually; Volume control unit, postemphasis/interpolation filter, multidigit ∑-Δ adjuster DSM and dynamic element matching unit DEM switch to standby mode; The analog output voltage of digital to analog converter decays to the simulation common-mode voltage gradually from the level of audio user signal, and de-noising control unit control selector is selected analog reference voltage output, makes the analog output of digital to analog converter realize the smooth transition of level.Driver element is amplified in output, and mixer and low pass filter also all enter the stand-by operation pattern.The analog output of digital to analog converter keeps output simulation common-mode voltage, has avoided explosion (Pop_Click) noise that causes in the handoff procedure from the normal mode to the standby mode effectively.
Effect of the present invention:
Noise elimination apparatus of the present invention and method, can solve the problem that there is voltage jump in the audio digital to analog converter analog output, thereby can solve explosion (Pop_Click) noise problem that audio digital to analog converter causes in mode of operation switching and upward and downward electric process.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
Description of drawings
Fig. 1 is the structural representation of digital to analog converter DAC product of the present invention;
Fig. 2 is a de-noising control unit control structure schematic diagram of the present invention.
Embodiment
The embodiment of mode of operation in the digital to analog converter of the present invention being switched explosion (Pop_Click) noise cancellation method that causes below in conjunction with accompanying drawing 1 and Fig. 2 elaborates.
Described digital to analog converter DAC comprises with lower module: audio serial interface 11, chip status machine 21, de-noising control unit 31, Serial Control port 23, the sample rate detection/timer manager 22 that connects the CLKIN pin, volume control unit 12, postemphasis/interpolation filter 13, multidigit ∑-Δ adjuster DSM and dynamic element matching unit DEM 14, low pass filter (analog switch capacitance filter SCF) 15, mixer 16, driver element 17, selector 18 and analog reference voltage generator 24 are amplified in output.
Described chip status machine 21 is being controlled the mode of operation of chip, and the switching programme of each element circuit under the different working modes;
Described volume control unit 12, control decays and attenuation change speed to the voice data of input;
Described postemphasising/interpolation filter 13 and multidigit ∑-Δ adjuster DSM and dynamic element matching unit DEM 14: being used for the input data conversion of high-resolution (representative value is 16 to 24), low sample frequency (representative value is that 8KHz is to 200KHz) is the digital signal of low resolution (representative value is 1 to 6), high sample frequency (representative value is 32 to 128 times of incoming frequency).
Described low pass filter 15 is converted into simulated audio signal to the digital audio and video signals of low resolution, high sample frequency, exports mixer to;
Described mixer 16, audio analog signals and other simulated audio signal that low pass filter is exported carry out the audio mixing processing, and the gain of mixer can be provided with by the user;
Described selector 18 is used for selecting output simulated audio signal or output analog references common-mode voltage at the analog output of audio digital to analog converter;
Described analog reference voltage generator 24 is used to produce an analog references common-mode voltage;
Described de-noising control unit 31 is according to the state of described chip status machine, start-up mode switching control program in chip operation mode switch process, thereby control volume control unit, low pass filter, mixer, driver element, the switch of selector and the situation of change of gain thereof are amplified in output.
In power up, the simulation of described digital to analog converter output beginning is at earth potential (0 volt), and de-noising this moment control unit circuit 31 states according to chip status machine 21 force control selector 18 to select the output analog reference voltage.Since analog reference voltage in power up along with supply voltage slowly is lifted to normal common-mode voltage value (representative value is half of input supply voltage), this moment, selector 18 shielded the output signal that driver element 17 is amplified in output, effectively eliminated explosion (Pop_Click) noise that the data transaction passage produces in power up.Power up continues for some time back (deciding on concrete application), and described digital to analog converter enters the stand-by operation pattern automatically.Before the user was provided with, selector 18 was selected the output analog reference voltage always.Behind the electrification reset, the initial setting up of volume control unit 13 is maximum attenuation N dB, and the gain of mixer 16 is maximum attenuation M dB, and the gain that driver element 17 is amplified in output is maximum attenuation K dB.Mixer 16 and output are amplified driver element 17 and all are operated in standby mode.
In following electric process, at first the gain of volume control unit 12 is provided with beginning from the user and is decreased to maximum attenuation NdB gradually with a certain step-length, the gain of output amplification driver element 17 is provided with beginning from the user and is decreased to maximum attenuation KdB gradually with a certain step-length, the gain of mixer 16 is provided with beginning from the user and is decreased to maximum attenuation MdB gradually with a certain step-length, makes the analog output voltage of digital to analog converter decay to the simulation common-mode voltage gradually from Audio Meter.Then, de-noising control unit 31 control selectors 18 are selected analog reference voltage output, make the analog output of digital to analog converter realize the smooth transition of level.At last, disconnect the power supply of chip, since analog reference voltage in following electric process along with supply voltage slowly drops to ground level, this moment, selector 18 shielded the output signal that driver element 17 is amplified in output, effectively eliminated explosion (Pop_Click) noise that the data transaction passage produces in following electric process.
Under the stand-by operation pattern, the simulation output of described digital to analog converter is common-mode voltage value (simulation ground level), volume control unit 12 is forced to the dB at maximum attenuation N, numeral is output as minimum amplitude, the gain of mixer 16 is maximum attenuation M dB, the gain that driver element 17 is amplified in output is maximum attenuation K dB, and selector 18 is selected output common mode voltage.When the user configures after all registers are provided with, send the instruction that enters normal mode of operation.Receive user's instruction when state machine 21 after, state machine 21 switches to normal operating conditions from holding state, and the control unit of de-noising simultaneously 31 starts mixers 16, driver element 17 and the changeover program of volume control unit 12 from the standby mode to the normal mode are amplified in output.At first open mixer 16, driver element 17 is amplified in output, enters normal mode of operation by standby mode, output simulation common-mode voltage (simulation ground level), and de-noising control unit 31 switches selector 18, selects output to amplify the signal of driver element 17.Then, the gain of de-noising control unit 31 control mixers 16 slowly is increased to the gain that the user is provided with a certain step-length from-MdB, the gain that driver elements 17 are amplified in de-noising control unit 31 control output slowly is increased to the gain that the user is provided with a certain step-length from-KdB, the gain of de-noising control unit 31 control volume control units 12 slowly is increased to the gain that the user is provided with a certain step-length from-NdB, make the gain of voice data slowly change to the gain level that the user needs from maximum attenuation, so when selector switches, guaranteed seamlessly transitting of digital to analog converter simulation output, thereby make the signal level of analog output slowly be varied to the audio user analog signal from the simulation common-mode voltage, the changeover program of end from the standby mode to the normal mode avoided voltage jump in the handoff procedure from the standby mode to the normal mode and explosion (Pop_Click) noise that causes effectively.
The changeover program of the present invention from the standby mode to the normal mode is as follows:
Step 1, state machine 21 receive the instruction (for example the user is provided with register by the Serial Control port) of operate as normal, the changeover program that de-noising control unit 31 starts from the standby mode to the normal mode.This moment, selector 18 was still selected output simulation common-mode voltage (simulation ground level).
Step 2, mixer 16 switch to normal mode of operation, mixer 16 output simulation ground levels from standby mode.
The gain of step 3, mixer 16 slowly is increased to the gain that the user is provided with a certain step-length from maximum attenuation MdB.
Step 4, output are amplified driver element 17 and are switched to normal mode of operation from standby mode, output simulation ground level, and the gain that driver element is amplified in output still gains for maximum attenuation KdB.
Step 5, de-noising control unit 31 switch selector 18, select output to amplify the signal of driver element 17, and two inputs of selector 18 all remain on the simulation common-mode voltage owing to this moment, so guaranteed seamlessly transitting of chip simulation output when selector switches.
The gain that driver element 17 is amplified in step 6, output slowly is increased to the gain that the user is provided with a certain step-length from maximum attenuation KdB.
Step 7, volume control unit 12 switch to normal mode of operation from standby mode, and this moment, the gain of volume control unit was maximum attenuation NdB.
The gain of step 8, volume control unit 12 slowly is increased to the gain that the user is provided with a certain step-length from-NdB, thereby makes the signal level of analog output slowly be varied to the audio user analog signal from simulation common-mode voltage (simulation ground level).
More than each step be not limited to described concrete order in implementing.
Under normal mode of operation, the gain that driver element 17 is amplified in volume control unit 12, mixer 16 and output all is user's setting, and selector 18 selects output to amplify the signal of driver element 17.After sending the instruction that enters standby mode as the user, state machine 21 switches to standby mode from normal mode, and de-noising control unit 31 starts volume control units 12, mixer 16 and output and amplifies the changeover program of driver element 17 from the normal mode to the standby mode.At first, the gain of volume control unit 12 is provided with beginning from the user and is decreased to maximum attenuation NdB gradually with a certain step-length, the gain of output amplification driver element 17 is provided with beginning from the user and is decreased to maximum attenuation KdB gradually with a certain step-length, the gain of mixer 16 is provided with beginning from the user and is decreased to maximum attenuation MdB gradually with a certain step-length, with volume control unit 12, postemphasis/interpolation filter 13, multidigit ∑-Δ adjuster DSM and dynamic element matching unit DEM 14 switch to standby mode, and the analog output voltage of digital to analog converter decays to the simulation common-mode voltage gradually from Audio Meter.Then, de-noising control unit 31 control selectors 18 are selected analog reference voltage output, make the analog output of digital to analog converter realize the smooth transition of level.Driver element 17 is amplified in output, and mixer 16 and low pass filter 15 also all enter the stand-by operation pattern.The analog output of digital to analog converter keeps output simulation common-mode voltage, finishes the changeover program from the normal mode to the standby mode.In this handoff procedure, avoided explosion (Pop_Click) noise that causes in the handoff procedure from the normal mode to the standby mode effectively.
The changeover program of the present invention from the normal mode to the standby mode is as follows:
Step 1, state machine 21 receive the instruction (for example the user is provided with register by the Serial Control port) that enters standby mode work, the changeover program that de-noising control unit 31 starts from the normal mode to the standby mode.
The gain of step 2, volume control unit 12 is provided with beginning from the user and is decreased to maximum attenuation NdB gradually with a certain step-length.
Step 3, volume control unit 12, postemphasis/interpolation filter 13, multidigit ∑-Δ adjuster DSM and dynamic element matching unit DEM 14 switch to standby mode.
The gain of step 4, output amplification driver element 17 is provided with beginning from the user and is decreased to maximum attenuation KdB gradually with a certain step-length.
The gain of step 5, mixer 16 is provided with beginning from the user and is decreased to maximum attenuation MdB gradually with a certain step-length.
Step 6, selector 18 are selected analog reference voltage 24 outputs.
Step 7, output are amplified driver element 17 and are entered the stand-by operation pattern.
Step 8, mixer 16 and low pass filter 15 also all enter the stand-by operation pattern.
More than each step be not limited to described concrete order in implementing.
Technology contents of the present invention and technical characterictic have disclosed as above; yet those of ordinary skill in the art still may be based on teaching of the present invention and announcements and are done all replacement and modifications that does not deviate from spirit of the present invention; therefore; protection range of the present invention should be not limited to the content that embodiment discloses; and should comprise various do not deviate from replacement of the present invention and modifications, and contained by the present patent application claim.
Claims (8)
1, a kind of cancellation element of digital to analog converter borehole blasting noise, it comprises the chip status machine, volume control unit, low pass filter, mixer, driver element and selector are amplified in output:
Described chip status machine is being controlled the mode of operation of chip, and the switching programme of each element circuit under the different working modes;
Described volume control unit, control decays and attenuation change speed to the voice data of input;
Described low pass filter is converted into simulated audio signal to the digital audio and video signals of low resolution, high sample frequency, exports mixer to;
Described mixer, audio analog signals and other simulated audio signal that low pass filter is exported carry out the audio mixing processing, and the gain of mixer can be provided with by the user;
Driver element is amplified in described output, and the audio analog signals that mixer is exported amplifies, and drives outside earphone or loud speaker, and amplifier gain can be provided with by the user;
Described selector is used for selecting output simulated audio signal or output analog references common-mode voltage at the analog output of audio digital to analog converter;
It is characterized in that: the cancellation element of described digital to analog converter borehole blasting noise also comprises a de-noising control unit, this de-noising control unit is according to the state of described chip status machine, start-up mode switching control program in chip operation mode switch process, thereby control volume control unit, low pass filter, mixer, driver element, the switch of selector and the situation of change of gain thereof are amplified in output.
2, a kind of cancellation element of digital to analog converter borehole blasting noise as claimed in claim 1, it is characterized in that: this cancellation element also comprises and postemphasising/interpolation filter and multidigit ∑-Δ adjuster DSM and dynamic element matching unit DEM, audio signal exports this to through volume control unit and postemphasises/interpolation filter and multidigit ∑-Δ adjuster DSM and dynamic element matching unit DEM and described low pass filter, exports described mixer to through low pass filter then.
3, a kind of removing method of digital to analog converter borehole blasting noise as claimed in claim 1 is characterized in that: in digital to analog converter chip power, following electric process, eliminate the Property of Blasting Noise that produces in this process by a switch control program of correspondence;
(1) control program in the power up is as follows:
Step 1, selector are selected output analog references common-mode voltage;
Step 2, mixer and output are amplified driver element and are all entered standby mode; The initial setting up of volume control unit is maximum attenuation N dB, and the gain of mixer is maximum attenuation M dB, and the gain that driver element is amplified in output is maximum attenuation K dB;
(2) control program under in the electric process is as follows:
Step 1, the gain of volume control unit is provided with beginning from the user is decreased to maximum attenuation NdB gradually with a certain step-length, the gain of output amplification driver element is provided with beginning from the user and is decreased to maximum attenuation KdB gradually with a certain step-length, and the gain of mixer is provided with beginning from the user and is decreased to maximum attenuation MdB gradually with a certain step-length;
Step 2, mixer and output are amplified driver element and are entered standby mode;
Step 3, selector are selected output analog references common-mode voltage.
4, a kind of removing method of digital to analog converter borehole blasting noise as claimed in claim 3 is characterized in that: the change in gain order of driver element is amplified in described volume control unit, mixer, output can do corresponding transposing according to different digital-to-analog converter structures; The switching sequence of driver element is amplified in volume control unit, mixer, output also can do corresponding transposing according to different digital-to-analog converter structures.
5, a kind of removing method of digital to analog converter borehole blasting noise as claimed in claim 1, it is characterized in that: switch to normal mode of operation and when normal mode of operation switches to standby mode, all have a corresponding with it switch control program to eliminate the Property of Blasting Noise that produces in this course of work from standby mode at the digital to analog converter chip;
(1) it is as follows to switch to the control program of normal mode of operation from standby mode:
Step 1, state machine receive the instruction of operate as normal, and the de-noising control unit starts the changeover program from the standby mode to the normal mode; This moment, selector was still selected output simulation common-mode voltage (simulation ground level);
Step 2, mixer switch to normal mode of operation from standby mode, mixer output simulation ground level;
The gain of step 3, mixer slowly is increased to the gain that the user is provided with a certain step-length from maximum attenuation MdB;
Step 4, output are amplified driver element and are switched to normal mode of operation from standby mode, output simulation ground level, and the gain that driver element is amplified in output still is maximum attenuation KdB gain;
Step 5, de-noising control unit switch selector, select output to amplify the signal of driver element, and two inputs of selector all remain on the simulation common-mode voltage owing to this moment, so guaranteed seamlessly transitting of chip simulation output when selector switches;
The gain that driver element is amplified in step 6, output slowly is increased to the gain that the user is provided with a certain step-length from maximum attenuation KdB;
Step 7, volume control unit switch to normal mode of operation from standby mode, and this moment, the gain of volume control unit was maximum attenuation NdB;
The gain of step 8, volume control unit slowly is increased to the gain that the user is provided with a certain step-length from-NdB, thereby makes the signal level of analog output slowly be varied to the audio user analog signal from simulation common-mode voltage (simulation ground level);
(2) it is as follows to switch to the control program of standby mode from normal mode:
Step 1, state machine receive the instruction (for example the user is provided with register by the Serial Control port) that enters standby mode work, and the de-noising control unit starts the changeover program from the normal mode to the standby mode;
The gain of step 2, volume control unit is provided with beginning from the user and is decreased to maximum attenuation NdB gradually with a certain step-length;
Step 3, volume control unit, postemphasis/interpolation filter, multidigit ∑-Δ adjuster DSM and dynamic element matching unit DEM switch to standby mode;
The gain of step 4, output amplification driver element is provided with beginning from the user and is decreased to maximum attenuation KdB gradually with a certain step-length;
The gain of step 5, mixer is provided with beginning from the user and is decreased to maximum attenuation MdB gradually with a certain step-length;
Step 6, selector are selected analog reference voltage output;
Step 7, output are amplified driver element and are entered the stand-by operation pattern;
Step 8, mixer and low pass filter also all enter the stand-by operation pattern.
6, a kind of removing method of digital to analog converter borehole blasting noise as claimed in claim 5 is characterized in that: the change in gain order of driver element is amplified in described volume control unit, mixer, output can do corresponding transposing according to different digital-to-analog converter structures; The switching sequence of driver element is amplified in volume control unit, mixer, output also can do corresponding transposing according to different digital-to-analog converter structures.
7, a kind of removing method of digital to analog converter borehole blasting noise as claimed in claim 1, it is characterized in that: chip power, down electricity, switch to normal mode of operation and when normal mode of operation switches to standby mode from standby mode, a corresponding with it switch control program is all arranged, be used for eliminating the Property of Blasting Noise that produces in the corresponding work process;
(1) control program in the power up is as follows:
Step 1, selector are selected output analog references common-mode voltage;
Step 2, mixer and output are amplified driver element and are all entered standby mode; The initial setting up of volume control unit is maximum attenuation N dB, and the gain of mixer is maximum attenuation M dB, and the gain that driver element is amplified in output is maximum attenuation K dB;
(2) control program under in the electric process is as follows:
Step 1, the gain of volume control unit is provided with beginning from the user is decreased to maximum attenuation NdB gradually with a certain step-length, the gain of output amplification driver element is provided with beginning from the user and is decreased to maximum attenuation KdB gradually with a certain step-length, and the gain of mixer is provided with beginning from the user and is decreased to maximum attenuation MdB gradually with a certain step-length;
Step 2, mixer and output are amplified driver element and are entered standby mode;
Step 3, selector are selected output analog references common-mode voltage;
(3) it is as follows to switch to the control program of normal mode of operation from standby mode:
Step 1, state machine receive the instruction of operate as normal, and the de-noising control unit starts the changeover program from the standby mode to the normal mode; This moment, selector was still selected output simulation common-mode voltage (simulation ground level);
Step 2, mixer switch to normal mode of operation from standby mode, mixer output simulation ground level;
The gain of step 3, mixer slowly is increased to the gain that the user is provided with a certain step-length from maximum attenuation MdB;
Step 4, output are amplified driver element and are switched to normal mode of operation from standby mode, output simulation ground level, and the gain that driver element is amplified in output still is maximum attenuation KdB gain;
Step 5, de-noising control unit switch selector, select output to amplify the signal of driver element, and two inputs of selector all remain on the simulation common-mode voltage owing to this moment, so guaranteed seamlessly transitting of chip simulation output when selector switches;
The gain that driver element is amplified in step 6, output slowly is increased to the gain that the user is provided with a certain step-length from maximum attenuation KdB;
Step 7, volume control unit switch to normal mode of operation from standby mode, and this moment, the gain of volume control unit was maximum attenuation NdB;
The gain of step 8, volume control unit slowly is increased to the gain that the user is provided with a certain step-length from-NdB, thereby makes the signal level of analog output slowly be varied to the audio user analog signal from simulation common-mode voltage (simulation ground level);
(4) it is as follows to switch to the control program of standby mode from normal mode:
Step 1, state machine receive the instruction (for example the user is provided with register by the Serial Control port) that enters standby mode work, and the de-noising control unit starts the changeover program from the normal mode to the standby mode;
The gain of step 2, volume control unit is provided with beginning from the user and is decreased to maximum attenuation NdB gradually with a certain step-length;
Step 3, volume control unit, postemphasis/interpolation filter, multidigit ∑-Δ adjuster DSM and dynamic element matching unit DEM switch to standby mode;
The gain of step 4, output amplification driver element is provided with beginning from the user and is decreased to maximum attenuation KdB gradually with a certain step-length;
The gain of step 5, mixer is provided with beginning from the user and is decreased to maximum attenuation MdB gradually with a certain step-length;
Step 6, selector are selected analog reference voltage output;
Step 7, output are amplified driver element and are entered the stand-by operation pattern;
Step 8, mixer and low pass filter also all enter the stand-by operation pattern.
8, a kind of removing method of digital to analog converter borehole blasting noise as claimed in claim 7 is characterized in that: the change in gain order of driver element is amplified in volume control unit, mixer, output can do corresponding transposing according to different digital-to-analog converter structures; The switching sequence of driver element is amplified in volume control unit, mixer, output can do corresponding transposing according to different digital-to-analog converter structures.
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